andrewlewis d05c15dee0 Add open @IntDef for track types
Also add handling of `C.TRACK_TYPE_IMAGE` in a couple of places where it was
missing.

#exofixit

PiperOrigin-RevId: 395078312
2021-09-06 15:04:47 +01:00
..
2021-09-06 15:04:47 +01:00